What is the 'kicking strap' (vang) used for?
Short answer
Holding the boom down to control mainsail shape
The kicking strap (also called the vang) pulls the boom downward to prevent it from rising. This controls the twist in the mainsail and maintains an efficient sail shape, particularly when sailing off the wind.
Quick check
What is the 'kicking strap' (vang) used for?